A more pressing concern is that the game seems to crash every time I try to put a fixture on a car. Any suggestions on how this can be fixed?
In the launcher there is a new button that says clear cache. Try that to see if it helps
Finally, the engineering time and production unit amounts for any trim or engine seem to have increased significantly compared to the previous build. What exactly is causing this?
Rebalance. It should take 3-5 years to engineer a car. The balance is about in the ballpark for campaign play.